桥梁预应力施工中经常会遇到实际伸长量与设计伸长量不符，且差值较大的情况。

During prestressing construction of bridge, it often appears the situation that the real elongation is not conformed to the design elongation and often with larger difference.

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根据计算和经验，侧弯伸长率小，且焊缝表面经过加工，不受表面质量影响，所以试验结果更接近实际，更为准确。

On the basis of calcuiation and experience, through side-bending test, test piece's extensibility is relative small, and its weld surface after processed is unaffected by the piece's surface quality.

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实际应用结果表明，以优化参数制作的压电陶瓷微位移器，在其伸长量、轴向刚度及频响范围等性能指标上可提高约20～30%。

Practical application results show that the actuator which is made up by optimum parameter is improved by about 20%—30% in its deforming length, axial stiffness and bandwidth.

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